Polyethylene film impact tester

Abstract

The present invention proposes a polyethylene film impact tester, including a base, a lifting seat, a test seat, a switchable dart group, a release mechanism, a dart return mechanism and a film clamping seat, wherein the lifting seat is arranged on the base, and the lifting seat includes a lower frame seat, an upper frame seat and a lifting structure; the test seat is arranged on one side of the upper frame seat, and the switchable dart group is arranged on the upper frame seat; the switchable dart group includes multiple groups of first drivers, multiple groups of magnetic seats and a switching structure; the release mechanism is arranged on the test seat; the dart return mechanism includes a recovery bucket, a recovery seat and a transverse structure; the film clamping seat is arranged between the test seat and the recovery bucket. The polyethylene film impact tester of the embodiment of the present invention can recover the test darts after free fall and reinstall them on the test bench. The darts replaced during the recovery process are automatically installed on the test bench for continuous testing, eliminating the cumbersome and complicated installation process and improving the efficiency of the impact test.

Description

Technical Field

[0001] The invention relates to the technical field of polyethylene film testing, in particular to a polyethylene film impact resistance tester. Background Art

[0002] Polyethylene film is a film material made of polyethylene as the main raw material. It has excellent physical properties and chemical stability and is used in packaging, agriculture, construction and medical fields. In order to evaluate the durability and damage resistance of polyethylene film and ensure product safety and user experience, it is necessary to take samples for impact resistance testing after the production of polyethylene film is completed to ensure that the quality of polyethylene film meets the requirements.

[0003] In the prior art, impact resistance testing of polyethylene films is often carried out with an impact tester. A dart is dropped to impact the surface of the polyethylene film, and the energy or impact mass when the number of polyethylene film samples damaged reaches 50% is measured. The impact force is changed by changing the diameter of the dart and the drop height to complete the impact resistance test of the polyethylene film. However, since the test result cannot be achieved in one test, continuous testing is required. The dropped dart needs to be retrieved and reinstalled on the test bench, and adjustments need to be made according to needs. The whole process is cumbersome and time-consuming, resulting in low efficiency of the impact resistance test of the polyethylene film and increased workload of relevant staff. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the purpose of the present invention is to propose a polyethylene film impact tester, which can recover the test darts after free fall and reinstall them on the test bench. The darts replaced during the recovery process are automatically installed on the test bench for continuous testing, eliminating the tedious and complicated installation process and improving the efficiency of impact testing.

[0006] To achieve the above-mentioned purpose, the present invention proposes a polyethylene film impact tester, comprising a base, a lifting seat, a test seat, a switchable dart-dropping group, a releasing mechanism, a dart-dropping returning mechanism and a film clamping seat, wherein the lifting seat is arranged on the base, and the lifting seat comprises a lower frame seat, an upper frame seat and a lifting structure, wherein the lower frame seat is arranged on the base, the upper frame seat is arranged on the top of the lower frame seat, and the lifting structure is arranged on the lower frame seat and connected to the upper frame seat; the test seat is arranged on one side of the upper frame seat and is connected with the interior thereof, and the switchable dart-dropping group is arranged on the upper frame seat; the switchable dart-dropping group comprises a plurality of groups of first drivers, a plurality of groups of magnetic seats and a switching structure, wherein the tops of the test seat and the upper frame seat are provided with mutually connected bar holes, and a plurality of the first driver plugs are inserted into the upper frame seat. Connected to the bar hole, multiple magnetic seats are arranged at the bottom end of the corresponding first driver, and a test dart is arranged at the bottom of the magnetic seat, and the switching structure is arranged on the upper frame seat and is connected to the corresponding first driver; the release mechanism is arranged on the test seat and is connected to the test dart; the dart return mechanism is arranged on the base, and the dart return mechanism includes a recovery bucket, a recovery seat and a transverse movement structure, wherein the recovery bucket is arranged on the base and is located at the bottom of the test seat, and a transverse movement groove connected to the lower frame seat is opened on the base, the recovery seat is arranged in the transverse movement groove and is located below the recovery bucket, and the transverse movement structure is arranged on the base and is connected to the recovery seat; the film clamping seat is arranged between the test seat and the recovery bucket.

[0007] The polyethylene film impact tester according to the present invention can recover the test darts after free fall and reinstall them on the test bench. The darts replaced during the recovery process are automatically installed on the test bench for continuous testing, eliminating the tedious and complicated installation process and improving the efficiency of the impact test.

[0008] In addition, the polyethylene film impact tester proposed in the application may also have the following additional technical features:

[0009] In one embodiment of the present application, the lifting structure includes a bar frame, a lifting block, a mounting cover, a first screw rod and a second driver, wherein the bar frame is plugged into the lower frame seat and the upper frame seat and connected to the upper frame seat, a lifting hole is opened on one side of the lower frame seat, the lifting block is arranged in the lifting hole and connected to the bar frame, the mounting cover is arranged on one side of the lower frame seat, the first screw rod is rotatably arranged in the mounting cover and is threadedly connected to the lifting block, and the second driver is arranged at the top end of the first screw rod and connected to the mounting cover.

[0010] In one embodiment of the present application, the switching structure includes a plurality of third drivers, a connecting block, a slot seat, a slider, a second screw rod and a fourth driver, wherein the plurality of third drivers are respectively arranged on the corresponding first drivers, the connecting block is sleeved on the plurality of third drivers, the slot seat is arranged on the upper frame seat, the slider is arranged in the slot seat and connected to the connecting block, the second screw rod is rotatably arranged in the slot seat and is threadably connected to the slider, and the fourth driver is arranged at one end of the second screw rod and connected to the slot seat.

[0011] In one embodiment of the present application, the release mechanism includes two supports, two support plates and a regulating structure, wherein the two supports are respectively arranged in the test seat and are located on both sides of the test dart, the test dart is a weight-shaped structure, the two support plates are respectively inserted and arranged on the corresponding supports and are connected to the test dart with pressure, and the regulating structure is arranged on the supports and is connected to the support plates.

[0012] In one embodiment of the present application, the regulating structure includes two gears, a lower rack, an upper rack and a fifth driver, wherein the two gears are rotatably arranged at the bottom of the support on one side, the lower rack and the upper rack are respectively arranged at the bottom and the top of the corresponding gears, and are respectively meshed and connected with the corresponding gears, the lower rack and the upper rack are respectively connected to the corresponding support plates, and the fifth driver is arranged on the support on one side, and is respectively connected to the two gears.

[0013] In one embodiment of the present application, the transverse movement structure includes two vertical plates, a driving gear, a sixth driver, a driving rack and two guide blocks, wherein the two vertical plates are respectively arranged at the bottom of the recovery seat, the driving gear is rotatably arranged between the vertical plates, the sixth driver is arranged on the vertical plate on one side and is connected to the driving gear, the driving rack is arranged in the transverse movement groove and is meshed with the driving gear, two guide grooves are opened on the base, and the two guide blocks are respectively arranged in the corresponding guide grooves and are connected to the recovery seat.

[0014] Compared with the prior art, the beneficial effects of the present application are: the test darts after free fall can be recovered and reinstalled on the test bench, and the darts replaced during the recovery process are automatically installed on the test bench for continuous testing, eliminating the tedious and complicated installation process and improving the efficiency of impact resistance testing.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0017] Figure 1 A schematic structural diagram of a polyethylene film impact resistance tester according to an embodiment of the present invention;

[0018] Figure 2 A cross-sectional view of a polyethylene film impact tester according to an embodiment of the present invention;

[0019] Figure 3 is a side sectional view of a release mechanism according to an embodiment of the present invention;

[0020] Figure 4 A partial cross-sectional view of a release mechanism according to an embodiment of the present invention;

[0021] Figure 5 A partial side sectional view of a dart return mechanism according to an embodiment of the present invention;

[0022] Figure 6 A three-dimensional diagram of a test dart drop according to an embodiment of the present invention.

[0023] As shown in the figure: 1. Base; 2. Lifting seat; 21. Lower frame seat; 22. Upper frame seat; 23. Lifting structure; 231. Bar frame; 232. Lifting block; 233. Mounting cover; 234. First screw rod; 235. Second drive; 3. Test seat; 4. Switchable dart drop group; 41. First drive; 42. Magnetic seat; 421. Test dart drop; 43. Switching structure; 431. Third drive; 432. Connecting block; 433. Slot seat; 434. Slider; 4 35. Second screw rod; 436. Fourth driver; 5. Release mechanism; 51. Support; 52. Support plate; 53. Adjustment structure; 531. Gear; 532. Lower rack; 533. Upper rack; 534. Fifth driver; 6. Dart return mechanism; 61. Recovery bucket; 62. Recovery seat; 63. Transverse structure; 631. Vertical plate; 632. Drive gear; 633. Sixth driver; 634. Drive rack; 635. Guide block; 7. Film clamping seat. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations of the present invention. On the contrary, embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0025] The polyethylene film impact resistance tester according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0026] like Figure 1-Figure 6 As shown, the polyethylene film impact resistance tester according to the embodiment of the present invention comprises a base 1, a lifting seat 2, a test seat 3, a switchable dart falling group 4, a release mechanism 5, a dart falling returning mechanism 6 and a film clamping seat 7.

[0027] The lifting seat 2 is arranged on the base 1 , and the lifting seat 2 includes a lower frame seat 21 , an upper frame seat 22 and a lifting structure 23 .

[0028] The lower frame seat 21 is arranged on the base 1 , the upper frame seat 22 is arranged on the top of the lower frame seat 21 , and the lifting structure 23 is arranged on the lower frame seat 21 and connected to the upper frame seat 22 .

[0029] It should be noted that both the lower frame seat 21 and the upper frame seat 22 are frame-shaped structures, which are hollow inside and can facilitate the transportation of the test dart 421. The lifting structure 23 facilitates the control of the upper frame seat 22 to move up and down based on the lower frame seat 21, thereby changing the height of the entire lifting seat 2, and then controlling the free fall height of the test dart 421, changing the impact force according to needs, and achieving the ultimate impact resistance test purpose.

[0030] The test seat 3 is arranged at one side of the upper frame seat 22 and is communicated with the interior thereof. The switchable dart dropping group 4 is arranged at the upper frame seat 22 .

[0031] It should be noted that the interior of the test seat 3 is a hollow structure, and an opening is arranged at the bottom to facilitate the test dart 421 to freely fall downward from the opening.

[0032] The switchable dart dropping group 4 includes a plurality of first drivers 41 , a plurality of magnetic seats 42 and a switch structure 43 .

[0033] Among them, the tops of the test seat 3 and the upper frame seat 22 are opened with interconnected bar holes, multiple first drivers 41 are inserted into the bar holes, multiple magnetic seats 42 are arranged at the bottom ends of the corresponding first drivers 41, and test darts 421 are arranged at the bottoms of the magnetic seats 42. The switching structure 43 is arranged on the upper frame seat 22 and is connected to the corresponding first drivers 41.

[0034] It should be noted that the first driver 41 can be an electric telescopic rod connected to the magnetic seat 42. An electromagnet and a groove can be set on the magnetic seat 42. The groove can fix and accommodate the test dart 421. The electromagnet can absorb and reinforce the test dart 421. By extending the first driver 41 downward and entering the lower frame seat 21, the recovered test dart 421 can be re-absorbed and fixed on the magnetic seat 42, so as to facilitate the subsequent direct switching of the test dart 421 for use.

[0035] The switching structure 43 can switch the test darts 421 set on the multiple magnetic seats 42, and send them into the test seat 3 for free fall control, so as to realize the impact resistance test function of the polyethylene film.

[0036] The release mechanism 5 is disposed on the test seat 3 and connected to the test dart 421 .

[0037] It should be noted that the release mechanism 5 can fix the test dart 421 sent into the test seat 3, and release the fixing effect of the test dart 421 when performing an impact test, and release the test dart 421 downward to allow it to fall freely, thereby realizing the anti-impact test function.

[0038] The dart returning mechanism 6 is arranged on the base 1 , and the dart returning mechanism 6 comprises a recovery bucket 61 , a recovery seat 62 and a transverse movement structure 63 .

[0039] Among them, the recovery bucket 61 is set on the base 1 and is located at the bottom of the test seat 3. The base 1 is provided with a transverse movement groove connected to the lower frame seat 21. The recovery seat 62 is set in the transverse movement groove and is located below the recovery bucket 61. The transverse movement structure 63 is set on the base 1 and is connected to the recovery seat 62.

[0040] It should be noted that the test dart 421 adopts a weight structure with a larger and heavier round head at the bottom, forming a structure similar to a tumbler. The recovery bucket 61 at the bottom can concentrate the test dart 421 and ensure that the test dart 421 vertically passes through the recovery bucket 61 and enters the recovery seat 62 at the bottom for fixation. A groove matching the test dart 421 is provided on the recovery seat 62 to facilitate the entry and fixation of the test dart 421. The transverse movement structure 63 can drive the recovery seat 62 loaded with the test dart 421 to move into the lower frame seat 21, and cooperate with the first driver 41 to drive the magnetic seat 42 to fall and re-adsorb and fix the test dart 421, thereby completing the resetting of the test dart 421.

[0041] The film clamping seat 7 is arranged between the test seat 3 and the recovery bucket 61 .

[0042] It should be noted that the film clamping seat 7 is used to fix the polyethylene film sample to be tested, and is mainly composed of two movable clamping frame plates. The frame structure facilitates the passage of the test dart 421. The two clamping frame plates cooperate to clamp and fix the polyethylene film sample, and are arranged between the test seat 3 and the recovery bucket 61. The test dart 421 released by the test seat 3 can impact the polyethylene film sample after free fall. After the test is completed, the film is removed, and the test dart 421 can directly enter the recovery bucket 61 at the bottom to complete the reset.

[0043] Specifically, when conducting an impact resistance test on a polyethylene film sample, first select a smaller test dart, operate the switchable dart group 4 and push it into the test seat 3, fix the polyethylene film sample through the film clamping seat 7, operate the release mechanism 5, and the test dart 421 falls freely to impact the polyethylene film sample. If the polyethylene film sample is not broken, release the fixation of the test area of ​​the polyethylene film sample, and let the test dart 421 fall into the recovery bucket 61, replace the test area of ​​the polyethylene film sample and re-fix it, repeat the above operation to replace the test dart 421 and perform the test again.

[0044] During the test, the recovery bucket 61 guides the recovered test dart 421 into the recovery seat 62, and sends it into the lower frame seat 21 through the transverse movement structure 63. Then, the corresponding magnetic seat 42 switched by the switching structure 43 at the top cooperates with the telescopic control of the first driver 41 to re-adsorb and fix the test dart 421 in its original position.

[0045] Continue to use test darts 421 of different diameters. If the test result cannot be obtained, the height of the test seat 3 can be raised by operating the lifting structure 23 to increase the impact force of the test dart 421 until the polyethylene film to be tested is broken. The impact force of the test dart 421 at this time is calculated to complete the impact resistance test of the polyethylene film.

[0046] In one embodiment of the present invention, Figure 2 As shown, the lifting structure 23 includes a bar frame 231 , a lifting block 232 , a mounting cover 233 , a first screw rod 234 and a second driver 235 .

[0047] Among them, the bar frame 231 is inserted into the lower frame seat 21 and the upper frame seat 22, and is connected to the upper frame seat 22. A lifting hole is opened on one side of the lower frame seat 21. The lifting block 232 is set in the lifting hole and is connected to the bar frame 231. The mounting cover 233 is set on one side of the lower frame seat 21. The first screw rod 234 is rotatably set in the mounting cover 233 and is threadedly connected to the lifting block 232. The second driver 235 is set at the top of the first screw rod 234 and is connected to the mounting cover 233.

[0048] It should be noted that the second driver 235 can be a servo motor, which is connected to the first screw rod 234 and can drive the first screw rod 234 to rotate, thereby driving the lifting block 232 to move up and down in the mounting cover 233. Since the lifting block 232 is connected to the bar frame 231, and the bar frame 231 is connected to the upper frame seat 22, it can drive the upper frame seat 22 to move up and down, thereby completing the lifting control of the lifting seat 2.

[0049] Specifically, when all the test darts 421 cannot meet the test impact force, the relevant staff can control the rotation of the first screw 234 by running the second driver 235, and then drive the upper frame seat 22 to lift through the lifting block 232 and the bar frame 231, thereby changing the height of the upper frame seat 22 and the test seat 3, and then increasing the impact force of the free fall of the test dart 421.

[0050] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, the switching structure 43 includes a plurality of third drivers 431 , a connecting block 432 , a slot seat 433 , a sliding block 434 , a second screw rod 435 and a fourth driver 436 .

[0051] Among them, multiple third drivers 431 are respectively arranged on the corresponding first drivers 41, the connecting block 432 is sleeved on the multiple third drivers 431, the groove seat 433 is arranged on the upper frame seat 22, the slider 434 is arranged in the groove seat 433 and connected to the connecting block 432, the second screw rod 435 is rotatably arranged in the groove seat 433 and is threadedly connected to the slider 434, and the fourth driver 436 is arranged at one end of the second screw rod 435 and is connected to the groove seat 433.

[0052] It should be noted that the third driver 431 can be an electric telescopic rod connected to the corresponding first driver 41, and can push the test dart 421 fixed on the first driver 41 by the magnetic seat 42, and control it to enter the test seat 3 for fixation, so as to facilitate the subsequent release mechanism 5 to release and test the polyethylene film.

[0053] The connecting block 432 aggregates multiple third drivers 431 and supports them. The fourth driver 436 can be a servo motor, which is connected to the second screw rod 435 to drive the slider 434 to slide in the slot seat 433, thereby controlling the activities of the connecting block 432, the third driver 431 and the test dart 421. Through this structure, the test dart 421 corresponding to the test seat 3 is changed, thereby realizing the switching function of the magnetic dart 421.

[0054] Specifically, when it is necessary to switch the test dart 421, the fourth driver 436 is operated to drive the second screw 435 to rotate, thereby driving the connecting block 432 and the test darts 421 on each magnetic seat 42 to move until the selected test dart 421 is aligned with the test seat 3, and the third driver 431 is operated to push the test dart 421 into the test seat 3 to complete the switching function.

[0055] In one embodiment of the present invention, Figure 3 and Figure 4 As shown, the release mechanism 5 includes two supports 51 , two support plates 52 and a regulating structure 53 .

[0056] Among them, two supports 51 are respectively arranged in the test seat 3 and are located on both sides of the test dart 421. The test dart 421 is a weight-shaped structure. The two support plates 52 are respectively inserted and arranged on the corresponding supports 51 and are pressed and connected with the test dart 421. The regulating structure 53 is arranged on the support 51 and is connected with the support plate 52.

[0057] It should be noted that the support 51 can accommodate the support plate 52, and the support plate 52 can move horizontally on the support 51. At the same time, the support plate 52 can be pressed and engaged on the top of the test dart 421 to fix it. After the fixation of the test dart 421 is released, the test dart 421 loses support and falls freely downward to complete the impact test. The regulating structure 53 controls the movement of the support plate 52.

[0058] In order to clearly explain the above embodiment, in one embodiment of the present application, Figure 3 and Figure 4 As shown, the regulating structure 53 includes two gears 531 , a lower rack 532 , an upper rack 533 and a fifth driver 534 .

[0059] Among them, the two gears 531 are rotatably set at the bottom of the side support 51, the lower rack 532 and the upper rack 533 are respectively set at the bottom and top of the corresponding gear 531, and are respectively meshed and connected with the corresponding gear 531, the lower rack 532 and the upper rack 533 are respectively connected to the corresponding support plate 52, and the fifth driver 534 is set on the side support 51, and is respectively connected to the two gears 531.

[0060] It should be noted that the fifth driver 534 can be a dual-axis motor, which controls the two gears 531 to rotate synchronously in the same direction. Since the lower rack 532 and the upper rack 533 are respectively connected to the two support plates 52 and are located on the lower and upper sides of the gear 531, under the drive of the gear 531, the lower rack 532 and the upper rack 533 move in opposite directions, thereby controlling the two support plates 52 to move in the opposite direction, thereby realizing the clamping or un-clamping function of the test dart 421 and completing the release of the test dart 421.

[0061] Specifically, when conducting an impact resistance test, the test dart 421 enters the test seat 3 and is clamped and fixed by the support plate 52. At this time, the magnetic fixation of the magnetic seat 42 is released. After the polyethylene film sample is flat and fixed, the fifth driver 534 is operated to control the gear 531 to drive the lower rack 532 and the upper rack 533, and drive the support plate 52 to release the fixation of the test dart 421. The test dart 421 falls freely to complete the impact resistance test function.

[0062] In one embodiment of the present invention, Figure 2 and Figure 5As shown, the transverse movement structure 63 includes two vertical plates 631 , a driving gear 632 , a sixth driver 633 , a driving rack 634 and two guide blocks 635 .

[0063] Among them, two vertical plates 631 are respectively arranged at the bottom of the recovery seat 62, the driving gear 632 is rotatably arranged between the vertical plates 631, the sixth driver 633 is arranged on one side of the vertical plate 631 and is connected to the driving gear 632, the driving rack 634 is arranged in the transverse groove and is meshed with the driving gear 632, and two guide grooves are opened on the base 1, and the two guide blocks 635 are respectively arranged in the corresponding guide grooves and are connected to the recovery seat 62.

[0064] It should be noted that the sixth driver 633 can be a servo motor, and the two vertical plates 631 support the driving gear 632. The sixth driver 633 controls the rotation of the driving gear 632, and cooperates with the driving rack 634 at the bottom to drive the upper recovery seat 62 to move horizontally, thereby achieving a control effect on the recovery seat 62. The guide block 635 cooperates with the guide groove to ensure the stability of the recovery seat 62 movement.

[0065] Specifically, after the test dart 421 enters the recovery seat 62, the sixth driver 633 can be operated to control the drive gear 632 to rotate, and the drive rack 634 can be used to drive the recovery seat 62 into the lower frame seat 21, and the retracted magnetic seat 42 can be used to fix the test dart 421 to reset it, and then the recovery seat 62 can be reset to facilitate the subsequent transportation of the test dart 421.

[0066] In summary, the polyethylene film impact tester of the embodiment of the present invention can recover the test darts after free fall and reinstall them on the test bench. The darts replaced during the recovery process are automatically installed on the test bench for continuous testing, eliminating the tedious and complicated installation process and improving the efficiency of impact testing.

[0067] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and deform the above embodiments within the scope of the present invention.

Claims

1. A polyethylene film impact tester, characterized in that: It includes a base, a lifting seat, a test seat, a switchable dart drop group, a release mechanism, a dart drop return mechanism and a film clamping seat, wherein: The lifting seat is arranged on the base, and the lifting seat comprises a lower frame seat, an upper frame seat and a lifting structure, wherein the lower frame seat is arranged on the base, the upper frame seat is arranged on the top of the lower frame seat, and the lifting structure is arranged on the lower frame seat and connected to the upper frame seat; The test seat is arranged at one side of the upper frame seat and is in communication with the interior of the upper frame seat, and the switchable dart dropping group is arranged at the upper frame seat; The switchable dart drop group includes multiple groups of first drivers, multiple groups of magnetic seats and a switching structure, wherein the tops of the test seat and the upper frame seat are provided with interconnected bar holes, multiple first drivers are plugged into the bar holes, multiple magnetic seats are arranged at the bottom ends of the corresponding first drivers, and a test dart is arranged at the bottom of the magnetic seat, and the switching structure is arranged on the upper frame seat and connected to the corresponding first driver; The release mechanism is arranged on the test seat and connected to the test dart; The dart return mechanism is arranged on the base, and comprises a recovery bucket, a recovery seat and a transverse movement structure, wherein the recovery bucket is arranged on the base and is located at the bottom of the test seat, a transverse movement groove connected with the lower frame seat is opened on the base, the recovery seat is arranged in the transverse movement groove and is located below the recovery bucket, and the transverse movement structure is arranged on the base and is connected with the recovery seat; The film clamping seat is arranged between the test seat and the recovery bucket.

2. The polyethylene film impact resistance tester according to claim 1, characterized in that: The lifting structure includes a bar frame, a lifting block, a mounting cover, a first screw rod and a second driver, wherein the bar frame is plugged into the lower frame seat and the upper frame seat and is connected to the upper frame seat, a lifting hole is opened on one side of the lower frame seat, the lifting block is arranged in the lifting hole and is connected to the bar frame, the mounting cover is arranged on one side of the lower frame seat, the first screw rod is rotatably arranged in the mounting cover and is threadedly connected to the lifting block, and the second driver is arranged at the top end of the first screw rod and is connected to the mounting cover.

3. The polyethylene film impact resistance tester according to claim 1, characterized in that: The switching structure includes a plurality of third drivers, a connecting block, a slot seat, a slider, a second screw rod and a fourth driver, wherein the plurality of third drivers are respectively arranged on the corresponding first drivers, the connecting block is sleeved on the plurality of third drivers, the slot seat is arranged on the upper frame seat, the slider is arranged in the slot seat and connected to the connecting block, the second screw rod is rotatably arranged in the slot seat and is threadably connected to the slider, and the fourth driver is arranged at one end of the second screw rod and connected to the slot seat.

4. The polyethylene film impact resistance tester according to claim 1, characterized in that: The release mechanism includes two supports, two support plates and a regulating structure, wherein the two supports are respectively arranged in the test seat and located on both sides of the test dart, the test dart is a weight-shaped structure, the two support plates are respectively inserted and arranged on the corresponding supports and are connected to the test dart with pressure, and the regulating structure is arranged on the supports and connected to the support plates.

5. The polyethylene film impact resistance tester according to claim 4, characterized in that: The regulating structure includes two gears, a lower rack, an upper rack and a fifth driver, wherein the two gears are rotatably arranged at the bottom of the support on one side, the lower rack and the upper rack are respectively arranged at the bottom and the top of the corresponding gears, and are respectively meshed and connected with the corresponding gears, the lower rack and the upper rack are respectively connected with the corresponding support plates, and the fifth driver is arranged on the support on one side, and is respectively connected with the two gears.

6. The polyethylene film impact resistance tester according to claim 1, characterized in that: The transverse movement structure includes two vertical plates, a driving gear, a sixth driver, a driving rack and two guide blocks, wherein the two vertical plates are respectively arranged at the bottom of the recovery seat, the driving gear is rotatably arranged between the vertical plates, the sixth driver is arranged on the vertical plate on one side and is connected to the driving gear, the driving rack is arranged in the transverse movement groove and is meshed with the driving gear, two guide grooves are provided on the base, and the two guide blocks are respectively arranged in the corresponding guide grooves and are connected to the recovery seat.

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